<html>
<style>
    body {
        width: 300px;
        position: relative;
    }
 
    .aside {
        width: 100px;
        height: 150px;
        float: left;
        background: #f66;
    }
 
    .main {
        height: 200px;
        background: #fcc;
        overflow: hidden;
    }
</style>
<body>
    <div class="aside"></div>
    <div class="main"></div>
</body>
</html>